asp.net - Why I can't get selected file on server side? -

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i have asp code:

        <asp:panel runat="server">               <div class="row2">             <input type="file" accept="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet, application/vnd.ms-excel" id="fileselect" name="fileselect" runat="server" />             <asp:button id="btnupload" runat="server" text="load" onclick="btnupload_click2" causesvalidation="false" />             </div>         </asp:panel>

here generated html code on browser:

<div class="row2">                            <input name="ctl00$contentplace$fileselect" type="file" id="ctl00_contentplace_fileselect" accept="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet, application/vnd.ms-excel">             <input type="submit" name="ctl00$contentplace$btnupload" value="load" id="ctl00_contentplace_btnupload">         </div> </div>

here code behind:

    protected void btnupload_click2(object sender, eventargs e)     {         httppostedfile file = request.files["fileselect"];                          }

after select file of input file element btnupload pressed code behind fired file value null.

if change row:

httppostedfile file = request.files["fileselect"];

to row:

httppostedfile file = request.files["ctl00$contentplace$fileselect"];

i selected file in file variable on server.

so question why can't file if use row:

httppostedfile file = request.files["fileselect"];

your input control runs @ server side, change id, , name posted need use uniqueid as

httppostedfile file = request.files[fileselect.uniqueid];

where in case fileselect.uniqueid return "ctl00$contentplace$fileselect" nane rendered control on html, 1 used on post.

you can see accessing control client name , not id in asp.net

how use type

to use line

httppostedfile file = request.files["fileselect"];

just remove runat="server" input control.


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